package com.atguigu.educenter.controller;

import com.atguigu.common_uitls.JwtUtils;
import com.atguigu.common_uitls.R;
import com.atguigu.educenter.entity.UcenterMember;
import com.atguigu.educenter.service.UcenterMemberService;
import com.atguigu.educenter.utils.ConstantProperties;
import com.atguigu.educenter.utils.HttpClientUtils;
import com.atguigu.servicebase.exception.guliException;
import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.net.URLEncoder;
import java.util.HashMap;

/**
 * zz: wzh
 * time 2022 10 03 20 01
 **/

@Controller//请求地址不需要返回数据
@CrossOrigin
@RequestMapping("/api/ucenter/wx")
public class WxApiController {
    @Autowired
    private UcenterMemberService ucenterMemberService;
    //生成二维码
    @GetMapping("login")
    public String getWxCode(){
        // 微信开放平台授权baseUrl
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";

        //对redirect_url进行URLEncoder编码
        String redirect_url= ConstantProperties.WX_OPEN_REDIRECT_URL;
        try{
            redirect_url = URLEncoder.encode(redirect_url, "utf-8");
        }catch (Exception e){
            e.printStackTrace();
        }
        String url=String.format(
                baseUrl,
                ConstantProperties.WX_OPEN_APP_ID,
                redirect_url,
                "atguigu"
        );
        //请求微信的地址
        return "redirect:"+url;
    }
    @GetMapping("callback")
    public String callback(String code,String state){
        try{
            //1获取code值,临时票据,获取验证码
            //2拿着code请求,微信固定的地址,得到两个值access_token和openid
            String baseAccessTokenUrl =
                    "https://api.weixin.qq.com/sns/oauth2/access_token" +
                            "?appid=%s" +
                            "&secret=%s" +
                            "&code=%s" +
                            "&grant_type=authorization_code";
            //拼接三个参数:id, 密钥,code值
            String accessTokenRrl=String.format(
                    baseAccessTokenUrl,
                    ConstantProperties.WX_OPEN_APP_ID,
                    ConstantProperties.WX_OPEN_APP_SECRET,
                    code
            );
            //请求这个拼接好的地址,得到返回两个值,access、token和openid
            //使用httpclient发送请求,得到返回结果
            String accessTokenInfo = HttpClientUtils.get(accessTokenRrl);
            System.out.println("accessTokenInfo"+accessTokenInfo);

            //从accessTokenInfo字符串获取出两个值access_token和openid
            //把accessTokenInfo字符串转换成map集合,根据map里面key获取对应的值
            //使用json转换工具Gson
            Gson gson = new Gson();
            HashMap map = gson.fromJson(accessTokenInfo, HashMap.class);
            String access_token = (String)map.get("access_token");
            String openid = (String)map.get("openid");
            UcenterMember member= ucenterMemberService.getOpenIdMember(openid);
            if(member==null){
                //访问微信的资源服务器，获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                //拼接两个参数
                String userInfoUrl = String.format(baseUserInfoUrl,
                        access_token,
                        openid);
                //发送请求
                String userInfo = HttpClientUtils.get(userInfoUrl);
                System.out.println("userInfo"+userInfo);
                //获取UserInfo字符串扫描人信息
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                String nickname =(String) userInfoMap.get("nickname");//昵称
                String headimgurl =(String) userInfoMap.get("headimgurl");//头像
                //将扫码人信息添加到数据库中去
                //判断数据库表中是否存在相同的信息 根据openid判断
                member=new UcenterMember();
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);
                ucenterMemberService.save(member);
            }
            //使用jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());
            //最后返回首页面,通过路径传递token字符串
            return "redirect:http://localhost:3000?token="+jwtToken;
        }catch(Exception exception){
            exception.printStackTrace();
            throw new guliException(20001,"登录失败");
        }
    }
}
